Tire flap



.Mai'ch 15', 1927.

J. JACOBS TIRE FLAP Filed Sept. 24. 1925 Patented Mar. 15; 1927.

VIUNIITED STATES TIRE FLAP.

Application filed September 24, i925. Serial Noi 58,291. i

This invention relates to improvements in tire flaps.

; It is customary to provide a fabric "flap between the inside of the tire casing and the inner tube so as to protect the inner tube from wear caused by coming in contact withthe rim and from pinching by the toes of the beads of the tire casing.

The usual flap is made of square woven light weight cotton fabric which shrinks in should preferably be made of rubber withsmooth sides and feather edges as rubber will not deteriorate when it becomes wet and always presents a smooth surface towards the inner tube.-

It is the object of this invention to pro duce a tire flap of flexible elastic cord material whichshall be so constructed that it will stretch in the direction of its length but be reenforced transversely by cord and which will not shrink. Y

My improved flap, briefly described, consists of a strip of cord material cut transversely of the cords, so that the cords extend transversely of the strip. Thisstrip is then heavily coated with rubber on both sides or is placed between two layers of rubber and vulcanized in place. The cords will prevent the strip from yielding trans;

versely but as there are no cords running lengthwise, the flap is very elastic in the direction of its length.

In order more clearly to describe my invention and to explain its construction and use, I shall have reference to the accompanying drawings in which:

Fig. 1 is a section through a tire casing and rim and shows my improved tire flap in place between the inner tube and the caslng;

Fig. 2 is a plan view of a portion of the flap showing parts thereof removed so as to expose the reenforcing cords which extend transversely;

Fig: 3 is a view similar to that of Fig. 2 but shows the cords placed diagonally Fig. 4c is a section taken on line H,- Fig.2;' V

Figs. 5 and 6 are transverse sections show- I ing two different shapes; ancl I Fig. 7 is 'a longitudinal section through Jon saloons, or DENVER, cotonano; I

theoverlapping ends and'shows the valve stem opening and feather edges.

Numeral 1' designates a tire rimsuch-as I are usually employed with straight side tires and 2 represents the tire casing. An inner tube 3 is shown in place within the casing and this is spaced from the beads of the tire and from the inner surface of rim 1 by means of my improved flap 4.

My improved flap is formed from a strip place between two rubber layers 6 whose edges are made thin so as to produce a flap with feather edges 7. InFig. 2 I have shown a construction in which the cords 5 of cord fabric which" is vulcanized in extend straight across the flap whereas in the construction shown in Fig. 3, thecords extend diagonally. When the flap is constructed in the manner shown in Fig. 2 there is no transverse elasticity as the cords do 'not stretch. In a longitudinal direction, however, the flap is very-elastic'as the transverse cords donot interfere in any way with.

the flap being stretched in the direction'of its length. Thefact that the flap is freely extensible lengthwise is of great importance as it makes it'possible-to employ it with clincher tires that are stretched over the rims. This is not practicable with the ordinary canvas flaps which do not stretch.

that the flap shall havea limited transverse The real strain on a flap of this kind is I elasticity, the cords'may be run on a' bias in the manner shown in Fig. 3. It is obvious that the transverse elasticity will increase directly with the angle that the cords make with the transverse line and that it will permit free transverse yielding when the cords extend parallel with the longitudinal axis of the flap. The inclination of the cords with respect to the transverse direction of the flap must, of course. be rather small as transverse elasticity is not essential although it may attimes be desirable to a very limited extent.

From the above it will be evident that I have produced a tire flap reenforced with cord fabric which extends transversely of or on a slight across the flap which flap is made from cord fabric embedded in rubber, all danger of shrinkage in either dlreetlon 1s obvlated and as'thecords' ex+ tend transversely it will have the maximum..

strength to resist crosswise strains. The feather edgesproteet theetu-besag iinst cheifing and the great flexibility andlengitudinal elasticity;permitss-the: fiwpz-to readily conform to the sides of the casing. illtheugh it hasbeemshownstnip; it may be made into an endless oe -Ting: frmuwhichi canibeu moulded 'fiinto': the propersize "and shape. A-; flap.- eonstrueted in: accordance rwi'thi the:

diselosure 1astslonger: and; givesbetter semzieeetham-thee;fabrieizfiaipsenew employed and .will inotipinehf theeimnerrvtwbess Qpeng ingsQS and 9i. areepgovidedune-ai'; theeends of the strip fertile-reception :of thevali/estem. 2 As the eoi'dsextend transversely, no additional reenfoi'eing is necessary around the stembpeningv I i v 7 Having now deseribediny invention, What I Chill 11 as new is: 25 l.- A tire flap cemprisinga strip of cord fabric, having the cords, extending transve rselyg thereof? and ya rubber; eeveiinggon each side of the strip. 7 V i 2'. A the flap having means that;substam- 30 tially prevents stretching, a transverse-s direction but; which permits: frees stretching; in zthepdii'eetion of the l8i1llilhi0fifll6fl2l3J v In testimony v wheree f-Lafiiiemy signature;-

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